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BLOCK 31 UNIT

Operated by HILCORP ENERGY COMPANY (P-5 386310) in the BLOCK 31 (PENN. 7620) field. Every figure below is a volume the Railroad Commission published, multiplied by a monthly price you can check.

Oil lease lease 51135District 08Field 09358900Hydrogen sulphide fieldOilCasinghead gasSaveExport
Value, all time
$44.0 M
Dec 2017 – May 2026
Value, last 12 filed months
$2.2 M
at the published price for each month
Months reported
102
no gaps in the span
Streams
2
oil, casinghead gas

The BLOCK 31 (PENN. 7620) field

The Railroad Commission's own record for the field this lease produces from, including the spacing rule that governs how close together its wells may be drilled.

These are facts about the field, not about this lease. The field holds 17 leases and 47 wells, and the rule below applies to all of them.

Discovered
1966-04-17
as the register files it
Field class
Oil and gas
the register's own label
Between wells
—
no field rule filed
From a lease line
—
no field rule filed

The register flags this field for hydrogen sulphide. That is a poisonous gas that occurs naturally in some formations. The flag is a property of the field as the Commission records it. It is not a measurement taken at this lease, and it is not a statement that gas is escaping anywhere.

What this lease produced, and what it was worth

Oil and condensate are valued on the volume the state records as disposed of; gas and casinghead gas on the volume produced. They are different columns of different files, and the difference is not cosmetic.

StreamBasisVolumeValue
OilDisposition561,981 bbl$34,434,873
Casinghead gasProduction2,822,472 Mcf$9,612,711
Total$44,047,585

Wells on this lease (28)

Every wellbore the Railroad Commission records against this lease key, with the depth, the last completion and the plug date exactly as filed. A well with no plug date is not stated to be producing — the state files no such flag.

These wells centre on 31.4619, -102.4478. A lease has no coordinate of its own — that point is the mean of its wells, and they span 3.3 miles.

31.46086, -102.45348 · centre of the wells drawn, derived

What these wells add up to

Every figure below is counted over all of this lease's wells, not over the rows listed above. The Railroad Commission files two facts about a well's state — a plug date and a proration-schedule flag — and a well can carry both, so they are published as separate counts and never merged into a status.

On the schedule
0.0%
0 of 28 wells
With a plug date
0.0%
0 of 28 wells
Median depth
9,100 ft
28 wells filed one
Completion to plug
—
no well filed both dates

What the state filed about each well

On the RRC proration schedule
00.0%
A plug date is filed
00.0%
BothOn the schedule and plugged. Neither fact cancels the other.
00.0%
NeitherNo plug date, and not on the schedule.
28100.0%

A plug date is the date the Commission recorded the wellbore as sealed with cement and abandoned. It is the only end-of-life fact Texas files. There is no "active" flag on a well, so this page does not print one — a well with no plug date is not stated to be producing.

How deep they were drilled

Total depth in feet, 28 of 28 wells. Median 9,100 ft, with the middle half between 9,080 and 9,203 ft; the shallowest is 9,000 ft and the deepest 10,460 ft. The median is published rather than the mean, because a single mis-keyed depth moves a mean and cannot move a median.

When they were last completed

Last completion by decade, 28 of 28 wells, Feb 1977 – Mar 2024. This is the LAST completion filed on each wellbore, not the first — a well recompleted in 2019 counts once, in the 2010s.

Completions filed
Feb 1977 – Mar 2024
28 of 28 wells

28 wells

42-10332080F 5F9,100 ftMar 2024——
42-10333790G 89,200 ftFeb 2024——
42-10333943F 7F9,290 ftFeb 2023——
42-10332143L 49,210 ftJan 2020——
42-10332688H 89,060 ftDec 2018——
42-10332542H 79,040 ftOct 2018——
42-10332695A 4S9,080 ftSep 2018——
42-10332572V 49,090 ftSep 2018——
42-10332569A 3S9,090 ftSep 2018——
42-10332936S 9D9,105 ftAug 2018——
42-10333864T 9N9,490 ftAug 2018——
42-10332415A 1S9,080 ftJun 2018——
42-10333825M 59,100 ftJun 2018——
42-10333995F 8F9,300 ftMay 2018——
42-10332039Y 89,125 ftApr 2018——
42-10334231S 12U9,303 ftDec 2017——
42-103329922DD9,100 ftOct 2017——
42-10332632S 59,080 ftJan 2014——
42-10330752D 39,000 ftDec 2007——
42-10333212N 69,100 ftOct 2007——
42-10332386B 3B9,050 ftOct 2007——
42-10303055Z 210,460 ftAug 2006——
42-10310548N 1N9,100 ftApr 2000——
42-10333163N 5N9,075 ftFeb 2000——
42-10331268P 89,000 ftDec 1999——
42-10333583G 9G9,300 ftSep 1999——
42-10331977P 14 U9,100 ftJan 1980——
42-10331405P 10 U9,089 ftFeb 1977——

The API number is the state's, prefixed 42 for Texas. A well is matched to this lease by the lease key the Commission files on the wellbore record, so a well that has moved between leases appears under each one it was filed against.

Every month this lease reported (102)

Volume × price = value, one row per cycle. The price columns are the same series published on the prices page — nothing here is modelled.

102 months

May 202600106.413.05$0
Apr 20261,73618,29298.932.87$224,235
Mar 20262,26022,50189.753.15$273,701
Feb 20262,03323,52363.503.75$217,314
Jan 20262,29620,26759.138.00$297,856
Dec 20252,21020,41956.664.41$215,335
Nov 20251,36417,50258.593.93$148,637
Oct 20251,82114,04359.383.30$154,541
Sep 20251,72520,56962.743.08$171,516
Aug 20251,80317,13463.933.01$166,921
Jul 20251,75819,49766.743.32$181,965
Jun 20251,71619,23066.483.13$174,245
May 20251,89715,08060.553.23$163,607
Apr 20252,12116,02662.363.54$189,048
Mar 20252,5939,39667.704.27$215,651
Feb 20252,41132,96270.884.34$313,974
Jan 20252,89930,67974.324.28$346,719
Dec 20242,81421,20668.993.12$260,330
Nov 20242,89620,18269.052.20$244,338
Oct 20242,84521,73871.372.28$252,641
Sep 20242,54023,52769.612.36$232,436
Aug 20242,33825,12675.632.06$228,674
Jul 20242,52323,63879.932.15$252,404
Jun 20242,76022,23478.082.63$274,065
May 20242,79227,13678.812.20$279,694
Apr 20243,00721,93384.451.66$290,332
Mar 20242,94126,36880.301.55$276,904
Feb 20243,13423,70876.091.78$280,753
Jan 20243,17127,85473.023.30$323,399
Dec 20232,94822,90571.262.61$269,873
Nov 20233,49526,34477.892.81$346,188
Oct 20233,36128,85785.443.09$376,253
Sep 20233,16929,21389.042.74$362,066
Aug 20233,06426,99280.522.67$318,860
Jul 20232,40516,82074.852.64$224,449
Jun 20233,11130,41768.962.26$283,231
May 20233,46630,19470.622.23$312,023
Apr 20233,59929,53678.122.24$347,248
Mar 20233,99728,95072.852.39$360,463
Feb 20233,96125,83175.112.47$361,202
Jan 20234,32930,55776.533.39$434,817
Dec 20224,76230,19776.415.73$536,865
Nov 20224,63531,19185.005.65$570,086
Oct 20225,51728,78787.185.86$649,772
Sep 20224,31531,08784.888.16$620,042
Aug 20224,94333,11994.529.13$769,495
Jul 20223,48733,912101.587.54$609,976
Jun 20224,36733,706115.097.98$771,478
May 20224,48432,790109.378.43$766,934
Apr 20224,71233,312104.226.84$718,859
Mar 20224,85428,932108.885.08$675,374
Feb 20224,75225,59991.054.86$557,051
Jan 20224,81628,82081.844.54$524,917
Dec 20215,32526,86271.323.90$484,517
Nov 20215,29424,35877.435.24$537,474
Oct 20215,93932,49979.795.71$659,568
Sep 20216,08227,34469.865.35$571,204
Aug 20215,55128,74966.024.22$487,815
Jul 20214,31620,95970.783.98$388,947
Jun 20216,40731,44269.493.38$551,516
May 20216,91349,97363.483.02$589,639
Apr 20216,441153,19260.362.76$811,347
Mar 20216,77341,15061.302.72$526,987
Feb 20213,89016,51957.805.55$316,489
Jan 20216,47427,08750.412.81$402,476
Dec 20205,82828,33544.642.68$335,971
Nov 20207,17034,29938.772.71$370,814
Oct 20206,93033,44636.972.48$339,096
Sep 20206,82235,73437.091.99$324,176
Aug 20207,62139,70039.982.39$399,376
Jul 20207,25236,59438.371.83$345,048
Jun 20207,54933,88634.901.69$320,738
May 20207,94736,97216.921.81$201,558
Apr 20208,39939,18814.751.80$194,595
Mar 20208,37237,97330.341.86$324,493
Feb 20208,32135,81949.881.98$485,997
Jan 20207,59538,13457.252.09$514,695
Dec 201910,29641,06359.012.30$702,191
Nov 20199,91043,62955.302.75$668,033
Oct 201910,06948,43253.472.42$655,524
Sep 20199,71345,89555.052.66$656,657
Aug 201910,45844,99853.112.30$659,116
Jul 201910,92444,17656.272.46$723,369
Jun 201910,87141,28652.782.49$676,623
May 201912,88943,69258.482.74$873,479
Apr 201912,95040,88462.632.75$923,518
Mar 201912,17231,79856.803.06$788,738
Feb 201913,09531,32950.852.79$753,358
Jan 201915,76432,95846.033.23$832,011
Dec 201817,08930,46546.594.19$923,686
Nov 201817,57224,07952.934.24$1,032,114
Oct 201817,40320,35661.443.40$1,138,412
Sep 201810,17210,78059.543.11$639,145
Aug 20189,61512,98159.403.07$610,938
Jul 20186,6589,65865.142.93$462,018
Jun 20186,6226,98860.183.08$420,013
May 20184,8953,90965.382.90$331,374
Apr 20181,46870563.842.90$95,762
Mar 20182,22581761.222.79$138,491
Feb 20183,8291,25661.782.77$240,030
Jan 20183,15828662.874.01$199,690
Dec 20170057.272.92$0

How to read this page

The arithmetic is one multiplication per stream per month. Here it is, worked, on a real row from the table above.

Apr 2026 — as filed, then multipliedworked
Oil                1,736 bbl  × $ 98.93 =   $171,742
Casinghead gas    18,292 Mcf  × $  2.87 =    $52,493

────────────────────────────────────────────────────
Month total                                 $224,235

The volumes are the state's, unchanged

Every barrel and every Mcf on this page is a number the Railroad Commission of Texas published in its monthly production query. Nothing is modelled, estimated or filled in.

The dollars are a multiplication, not a valuation

Volume × a published monthly price. It is not what the operator was paid: it takes no account of a contract, a differential, a transportation deduction, or the share any one owner holds.

Oil and gas are priced differently

Oil is a Texas realisation — the crude oil first purchase price. Gas is a benchmark, because no free Texas wellhead gas series exists at any date. The prices page publishes the difference rather than correcting it away.

A lease is not a well

The state reports oil on lease and gas on well, and this page is the lease grain. 08/O/51135 is the state's own key, not one this site invented.